Localstorage：如果< li>的ID存在于localstorage警报中 [英] Localstorage: If the ID of a <li> exists in localstorage alert

问题描述

我想检查localstorage中是否存在< li> 的I​​D以提醒...

I want to check if the ID of a <li> exists in localstorage to alert...

例如，li有id，例如item-1，item-2，item-3等。在localstorage中有一个名为 id 的值，它获取一个具有相同名称的字符串：item -1，item-2，item-3。我想检查，当我点击带有id item-2的li时，如果item-2存在于localstorage中以进行相应的警报。

For example, the li's have id such as item-1, item-2, item-3 etc. In localstorage there is a value named id and it gets a string with the same name: item-1, item-2, item-3. I want to check, when I click on a li with id item-2, if that item-2 exists in localstorage to alert accordingly.

这是我的HTML：

<ul id="bxs" class="tabs"> 
    <li id="item-1">1</li> 
    <li id="item-2">2</li> 
    <li id="item-3">3</li> 
    <li id="item-4">4</li> 
    <li id="item-5">5</li> 
</ul>
... etc

这就是我的localstorage的样子：

And this is what my localstorage looks like:

Key: result

Value: [{"id":"item-1","href":"google.com"},{"id":"item-2","href":"youtube.com"}] 

等。

我将列表添加如下：

var result = JSON.parse(localStorage.getItem("result"));
if(result != null) {
    for(var i=0;i<result.length;i++) {
        var item = result[i];
        $("#bxs").append($("<li></li>").attr("id", item.id).html(item));

    }
}

我希望，当我点击在< li> 上检查他们的ID是否在localstorage中作为 id 存在并相应地发出警报。这样的事情：

and I want, when I click on the <li>'s to check if their ID exists as an 'id' in localstorage and alert accordingly. Something like this:

$("#bxs").on('click', 'li',function() {
// if exists alert('exists') else alert('doesn't exists')   
    });

我试过这个，但它总是警告它不存在：

I tried this but it always alert that it doesn't exists:

var result = JSON.parse(localStorage.getItem("result"));
        if(result != null) {
            for(var i=0;i<result.length;i++) {
                var item = result[i];
                if(item.id != null) {
                    alert('doesnt exists');
                }else {
                    alert('exists');

                }
            }
        }

推荐答案

在这里

$("#bxs").on('click', 'li',function() {
    var exists = false
    for(var i=0;i<result.length;i++) {
        var item = result[i];
        if(item.id == $(this).prop("id")) {
            exists = true;
            break;
        }
    }
    if(exists) {
        alert("exists");
    }
    else {
        alert("doesn't exists");
    }
});

这篇关于Localstorage：如果< li>的ID存在于localstorage警报中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！